Xsylvenus w walker



UNITED STATES' 'LSYLYENUS WALKER, 0F NEWV YORK, N. Y.

LOCK FOR PlANO-FORTES.

Specication forming part of Letters Patent No. 47,349, dated April 1S, 1865.

To all whom it may concern:

Be it known that I,\SYLvENUs WALKER, ot' New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Piano- Forte Locks; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this specication, in which the marks of reference correspond in all the figures.

My said improvements form a simple and durable lock in which the bolt moves diagonally, and hence applicable to pianofortes, melodeons, sewing-machines, chests, and writngdesks, boxes, sliding doors, 85e.

My invention also embodies certain forms of construction calculated to simplitythe process of manufacture ofthe lock and reduce the cost, a peculiar construction ot' the bolt which moves` diagonally through the faceplate and corresponding catch-plate, in the operation of locking and unlocking, and may be constructed to lock and unlock by means fof a key with a square end, or one with abit,

with equal facility.

To enable others to construct and use my invention, I will proceed to describe the construction and operation of the same.

ln the drawings annexed, Figure l is a perspective view. Fig. 2 shows the inside ot the lock, the front-plate being removed, showing the bolt in a locked position. Fig. 3 is a similar view showing the bolt in an unlocked position. Fig. 4 is a view of its construction for chests, writing desks, Src., in which a key with a bit is substituted for the one with a square end, as in Figs. 1, 2, and 3. Fig. 5 is a similar view showing the bolt in an unlocked position. Fig. 6 is a view of the catch-plate. Fig. 7 is a view of the squareended key for Figs. 1,2, and 3. Fig. S is a view of the key for the lock, as shown in Figs. 4 and 5. lt will be observed the tumbler is omitted, as the bit of the key actuates the bolt in a similar manner as the tumblcrs in the former figures.

A represents the or other metal.

B represents the bolt having a wedgeshaped end.

C represents the tumbler having a square hole in its center for the key to operate the bolt.

D represents the spring for holding the bolt in its locked or unlocked position.

e represents a small slot in the rear end of face plate, of sheet'brass the bolt to guide the direction of the bolt by means of the smallpin t, also forming a stop for the bolt.

G represents the catchplate, of sheet brass,

with a slot corresponding to thebolt B, also screw-holes for fastening the same to the top i H represents a key with a square end, also p K represents a key with a bit to operate the bolt in the operation of locking or unlocking, as shown in Figs. 4 and 5.

t t are to represent the two side plates ot' the lock with a key-hole in the frontone to correspond to the style ot' key to be used.` These plates are held together by two rivets,

i" fr. 1t will be observed that the spring D is acted upon bythe bolt I3, being moved up and down by means of the key in locking the bolt, the two notches upon the upper side that the end of the spring catches into, to v hold the bolt in a locked or unlocked posi! tion. It will be observed that the circular part ot' the bolt between those two notches operates upon the spring in the usual manner as in ordlnary locks.

This lock 1s designed as a mortiselock.

The body part of the lock is to be let iutothe woodwork until the face-plate presents a smooth, even surface with the same, so that no part of the lock or catch-plate projects when unlocked and open, 'but when locked the bolt rises up through the face-plate and catchplate diagonally, thereby locking the two together in a very simple and effective manner, as shown in the several figures. Locks of this class as heretofore constructed are very complicated, and expensive of manufacture, besides being very liable to become disarranged and defective of operation. It the top or cover become warped it will not lock. The advantages of my invention are designed to overcome all these objections. I have designed to speak of what I consider as new in my invention,`leaving out that which ment of the bolt B, substantially in the man-` ner and for the purposes set forth.

' SYLVENUS WALKER. Witnesses:

L. M. DOUDNA, J. l?. Karssna. 

